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Commit 343d8fc2 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

posix-cpu-timers: Avoid timespec conversion in do_cpu_nanosleep() 



No point in converting the expiry time back and forth.

No point either to update the value in the caller supplied variable. mark
the rqtp argument const.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
parent 2b2d0285

kernel/time/posix-cpu-timers.c

+5 −4
Original line number Diff line number Diff line
@@ -1227,10 +1227,11 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx, 
}



static int do_cpu_nanosleep(const clockid_t which_clock, int flags,

			    struct timespec64 *rqtp)

			    const struct timespec64 *rqtp)

{

	struct k_itimer timer;

	struct itimerspec64 it;

	struct k_itimer timer;

	u64 expires;

	int error;



	/*
@@ -1279,7 +1280,7 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags, 
		/*

		 * We were interrupted by a signal.

		 */

		*rqtp = ns_to_timespec64(timer.it.cpu.expires);

		expires = timer.it.cpu.expires;

		error = posix_cpu_timer_set(&timer, 0, &zero_it, &it);

		if (!error) {

			/*
@@ -1312,7 +1313,7 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags, 
		 * Report back to the user the time still remaining.

		 */

		restart = &current->restart_block;

		restart->nanosleep.expires = timespec64_to_ns(rqtp);

		restart->nanosleep.expires = expires;

		if (restart->nanosleep.type != TT_NONE) {

			struct timespec ts;